//初始化样式
article,aside,details,figcaption,figure,footer,header,hgroup,main,nav,section,summary {
  display: block
}
audio,canvas,progress,video {
  display: inline-block;
  vertical-align: baseline
}
audio:not([controls]) {
  display: none;
  height: 0
}
[hidden],template {
  display: none
}
html {
  font-family: sans-serif;
  -webkit-text-size-adjust: 100%;
  -ms-text-size-adjust: 100%
}
body {
  margin: 0
}
a {
  background: transparent;
  text-decoration: none;
}
a:active,a:hover {
  outline: 0
}
abbr[title] {
  border-bottom: 1px dotted
}
b,strong {
  font-weight: bold
}
dfn {
  font-style: italic
}
h1 {
  font-size: 2em;
  margin: 0.67em 0
}
mark {
  background: #ff0;
  color: #000
}
small {
  font-size: 80%
}
sub,sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline
}
sup {
  top: -0.5em
}
sub {
  bottom: -0.25em
}
img {
  border: 0
}
svg:not(:root) {
  overflow: hidden
}
figure {
  margin: 1em 40px
}
hr {
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  height: 0
}
pre {
  overflow: auto
}
code,kbd,pre,samp {
  font-family: monospace, monospace;
  font-size: 1em
}
button,input,optgroup,select,textarea {
  color: inherit;
  font: inherit;
  margin: 0
}
button {
  overflow: visible
}
button,select {
  text-transform: none
}
button,html input[type="button"],input[type="reset"],input[type="submit"] {
  -webkit-appearance: button;
  cursor: pointer
}
button[disabled],html input[disabled] {
  cursor: default
}
button::-moz-focus-inner,input::-moz-focus-inner {
  border: 0;
  padding: 0
}
input {
  line-height: normal
}
input[type="checkbox"],input[type="radio"] {
  box-sizing: border-box;
  padding: 0
}
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  height: auto
}
input[type="search"] {
  -webkit-appearance: textfield;
  -moz-box-sizing: content-box;
  -webkit-box-sizing: content-box;
  box-sizing: content-box
}
input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none
}
fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em
}
legend {
  border: 0;
  padding: 0
}
textarea {
  overflow: auto
}
optgroup {
  font-weight: bold
}
table {
  border-collapse: collapse;
  border-spacing: 0
}
td,th {
  padding: 0
}
html,body,div,span,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption,tbody,tfoot,thead,tr,th,td,article,aside,canvas,details,embed,figure,figcaption,footer,header,hgroup,menu,nav,output,ruby,section,summary,time,mark,audio,video {
  margin: 0;
  padding: 0;
  border: 0;
  font: inherit;
  font-size: 100%;
  vertical-align: baseline
}
html {
  line-height: 1
}
ol,ul {
  list-style: none
}
table {
  border-collapse: collapse;
  border-spacing: 0
}
caption,th,td {
  text-align: left;
  font-weight: normal;
  vertical-align: middle
}
q,blockquote {
  quotes: none
}
q:before,q:after,blockquote:before,blockquote:after {
  content: "";
  content: none
}
a img {
  border: none
}
article,aside,details,figcaption,figure,footer,header,hgroup,main,menu,nav,section,summary {
  display: block
}